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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfec0489344f7e68cd22255a66cfd6018f5fae770a49fb906e59ed3509c1992' 
  AND token = '67H/D+EMXnoVw8aouXmfYOI5WCrBDpp/qDukH5W1rgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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