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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb57c654e174c972115c554cea5d318fb3d32c1764e1e86dfa07a2437a0bbba' 
  AND token = 'fLyG2h6BxEaAJLiGk3suupGZWk03gg9ieujxdX5Bt38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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