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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cb4e6f86d692470be309fa45f3bd1f073fed1186a0a0a9d22d18330c91cb4b' 
  AND token = 'E8+1brlx9WEt+cqfiaPhE6fg4vP/u6BXf+89kt74puQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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