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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe4ceca9db3ea606abf77517080a297f6b592015bdd77a97d7087573da94075' 
  AND token = '6favPD8eBRgAaR0DF5g7qbGFfy7wHkptxo74BhuGKVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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