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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50194b1bc3b6e949c340f64a49b7db14b1b3fb1b52a2cd11e1062ae042769c8' 
  AND token = 'mAqYdv/xXO2Pd275eKPMCBKeS6Ab2Bn1ka6U72F4kHU=' 
  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"
    }
  }
}