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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4394dc2aee651ac6a82db088d8246ad771e1249da82d5ca81f71f3acf6321260' 
  AND token = 'eSBj9RL8wmDvxpg0ceaP2FJSDITu/mOqYdxkdSvk81w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}