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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca04d6bcf43e3f6babca2ef3131c41fe94553f07e43fbfd901a44b49306cad96' 
  AND token = 'LEASD2y1wxljMBy5y446lCpwj1i0JD2EGyCxImNY5tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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