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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f717e7663d958c7ed6efce405474cd4e570a9e409d4a2b8d18f7bf62b1bad6d4' 
  AND token = 'OP38vwgKi2bUcKGJd2OYfYZ7Gn6SWoF92AZMO+2dw2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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