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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd898ac0f05e794d413f0a6c881fe809389fc6da9388a63ec7167ae1b4089fb35' 
  AND token = 'PAl17l5Lf9nMZojxCQbjdtDnsqs3K1W6SNEcS3Cv+mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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