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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b47e3c6105335492f903b716a0027fc2742d004d7173c8618f872133b7224b5' 
  AND token = 'JxZ1iInpZiTEko76LBHjYE/8l3LCSh3fx0o4kMl7HYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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