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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd58fca8e0198ba97a2007e9e263878b03061f3b0e33bf06cb53d5fa7992de22' 
  AND token = 'fhW2lsMB00ESuD92Cv1ll+5uMv/k1h3G4fTv+mmjonk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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