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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bc5680503fc05eaec6e86734697847f07b6f05091f585bec632b71e26e00b1' 
  AND token = 'wakUZ2Xvk9coDbp1qdeIHnw6duUooHtMw4kdJxuuJ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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