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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852e1df6058e85834dc271ec9e71b819342d8249281d9dc351f5cb514a521ce8' 
  AND token = 'z0Pq908T7tiQ4cXVOsxbsdNfYGJ9WrkA0b80FVdaxF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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