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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5939eac910fa4e57bd52ccdbe75d1fb07e8d5a857662c40d356b23490469fc30' 
  AND token = 'fK/nqC/LHKujojE0bNGbalbbL324wL9g9tC1Iy5cOc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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