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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529209bb2f43abb560c1f7ababcbf235b991baf606db50c9057aad1d07006a24' 
  AND token = '6d9oOuNVNzmVkk2R+5+Zysf3L3cngnDfF063NXfEG+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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