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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95a78b78b3f4a2f6c424056bd27caf22e560ce83d4a46cc97b07ae07ab0664f' 
  AND token = 'aMZWeX7AYIS3x1tlEZd/vT3o81BEAa9++vieVipTt4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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