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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1dec50903a662fe03d7f61a9cb8e356defa99c811d845a8568a6a7cd052629' 
  AND token = 'ktxSvphK8ij+sJ+THY+ZmHl7WEvMw7lhtQ+cEAkpmE4=' 
  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"
    }
  }
}