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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907fe4db86bd3bc4e492a7d186396c0605db71b459b878e0ec7657af4573701b' 
  AND token = 'FaqUKCCgp2O/2AUcOBzI6oBj+8q9WGn0epcMQqnWoRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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