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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a648969e936c55f65f53c4ef0fe58afe684fcce42200e849a212d2148896551' 
  AND token = 'mskgLmAStdtKZ8l882nKd/mhnNz8a9QB4il7VLstT+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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