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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce69f3d35b8dd5b4203f9f901025b74fb61de575ae6ac57242cada4c811e60ed' 
  AND token = 'C+gG7PabQxqMFqlelYQxseXaPuq8tNy8KgdsCKmAmfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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