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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e8284e8f040fb64a7211bb60ac20ec82f06d0fe568e67803a44e0fb369fb4a' 
  AND token = 'l+hQTcrnIDkwX4/tL1GzB6HN73laFwp4butIA2R4vbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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