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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05041b0f7bc45925b8e8ab3e5452d887672dfab1951e96c049d09cc601a9ccef' 
  AND token = '4qpy/qr9S9uiCY6DEWOlrfSUeUbhyD6L2QV+czR5XMI=' 
  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"
    }
  }
}