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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa54d8ed49cf9169a6a282bbd1feb75f9e8c354259cf550d8d9bb6c040ebabc' 
  AND token = 'zFDrrSe2ILSIz5IFzYn27mOPR+BsVvqeqhvBniQIzv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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