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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57939d1390fb37fd89d7601e58f8a36d05575e5e55958e430f63e8450479818' 
  AND token = 'e7wQcPtluz1/3GxBNh+89e75KXXSbgtiUBQ57AjTlfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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