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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbec45603b1e2f63782caa11e31e357fb2f9d355891117bfeff00e518b53d562' 
  AND token = 'dW19mTa6ghfcaahMISSznE9Babdh8thqYzSgevHvXAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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