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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a26e8a283a261b5aadf8698f58490a2f3c123048b4496d3cb78564ecd9469c' 
  AND token = 'KtUfRqlQ0w2bRL9fPy3Jecl4Mbu8LiUgJ+P+mObbKXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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