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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eb587249cc6ad8fa29656b72e61ca5bbb567d243199f6bc0aba1ce924021d2' 
  AND token = 'aLeaBNijNo0HcvMczgZKpftmXCOh8/66hP2d7pmdobU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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