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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48afc5ff258e52910e823e5ac4ced4df08716d89d9c2bcce8b7716b8c34b0944' 
  AND token = 'QIXKC2DtSGkabVy59rEchJOVEfHyc1/82qAUPqKzh3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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