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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fdc4469efa9dea422659a8d3f51408d9b02f32d1c13f98cac2cef5b2c3cca1' 
  AND token = 'h8VR/gm5HYR/t/SdZLNTNQy1Ff4Iau3vTXz6bp4h78o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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