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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e9dd013a69a7822bcdb9c208b6fa3b27e0d87570d8c831ac54af6343277135' 
  AND token = 'CbRiS8UjXJHWoi9ny/BnTzmvhleOS75p3Lp4vRbtZ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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