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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1eb8be86b8138e1700d0ec1d1d3c3624c8480acdd0310a21df4842dbb08690f' 
  AND token = '2YQ643+FO0YGz1Rrm1kt9vERrvDTsC1o3nZ/m+5GYYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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