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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc7076f9160518691dad4816a4ea87409b9f972627232e9bbfa7ce1d7eebc49' 
  AND token = 's9Rt+ynNwYhC1+JCO+jdlpvEGMFR3hji9QIts38WXcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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