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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb6072d9c780179a671d04f38836d64a1105568f41582070ca3799c79a99282' 
  AND token = 'pjm7ynpyY6Wi2XptsTOCH1Zvjd6TdoRGPTyxqOS65qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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