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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994c1218c3329dd16a157fbc7d957e8392d081031b887ba76025eae2ab09f1d3' 
  AND token = 'ZnKgzrVwDn0L2DSA9MKYYqTl3W6zEmZABdB6lBqO6tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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