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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7d02f7d594933faa85b0da57e2667a0ec9a8a4672025ae4fe2ebfbc249980f' 
  AND token = 'iHTf8UWpsG7XwObkz60gGx+tLu1GJnHnC4O1uAUI9jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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