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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b9b07168fa9f3f1e22298e8b4c219ea0e2ecb786e040fa2242fbdfcc494e23' 
  AND token = 'YYNWLemeGDie9KOo2usZjyysoKo68eK/h7HS5Ui85Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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