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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb849ba1ff2e0d5c31f91645ed5a37465f66f3d2f4932ea1f66419ee72a3f9f' 
  AND token = 'FvJDtCPodera9LC16IBpsxSyfZSUeRya0s9oUzj36cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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