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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7770ebcdae0a0bd40b2eff3f998ec59384d4f5d16a48f6ab95bc6bea3996f3' 
  AND token = '9tqO505eS+l989DME2Qo7x4bWXgnGXOb0/mdHQne6v4=' 
  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"
    }
  }
}