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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff026ce5526248c2900a719e9708ce8d1fd06efb03fbba0706a1619e29bdc575' 
  AND token = '8cwrC1JIJbvA4sGHEtM7A0xmkB0Edo60rWl5mBBuvd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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