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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecebf95a402e7771f2f7a4bf40b295b29ceae098acd47eda8d5933238a62a2f5' 
  AND token = 'ggxMlsLhVD8glKDWfTg5lkKEpBq3W24gJge6acz1jN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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