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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768421981cc2e2ac29995d673bfc6e6ef8d2eee119e07d11df989c989bdd7d84' 
  AND token = '08sW/u+s03g/KzO2KhlHAVU7y/CLrwYh96ezPpqAnm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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