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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8924c336c264d43443b9b93b9f7c71828a0ceb8ef5e9d88e8252e28d9b0d1c' 
  AND token = 'ox63kkGcxe9fxBvg4Rgn2d+EBk1aBDwwBcWlCGnxXLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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