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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07dfc9c3c1703cfd07a61d1c6ccc3fa41f2a2ede22d9821883253d8cc74a2a2a' 
  AND token = 'uo9t2urLyzBu6I1VY6RVwYRRbrgM63UblinZuOO0Mgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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