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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c7b8d5ea0d20715d6ee021e463e68586c848fc4fb2dda45b97a0a7c2e23b3c' 
  AND token = 'bNsHljzyi42KwPiu2l+bhtFjCMYj+npxVVNxOJSLHWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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