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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5719a9d96ec39dd758b782279ad0ab8e66b0b98bfe74c0b4217869904254d1a' 
  AND token = '7c6h0Pb16E/I/jgzNqG6XPt8cHTTZQfe7Q48pos7kBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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