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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf991468b2e23c4c1a6cdf6ab848beae6a5a06da539c566af5ced3cba2df4df' 
  AND token = 'Vu8a8Rtefz7ze1pN5sSR/AXqrrLytYA0YOjctw3+ob0=' 
  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"
    }
  }
}